What is the critical safety instruction one must follow when preparing to use rosemary essential oil topically, such as in a facial steam?

Answer

Ensure meticulous dilution in a carrier oil or water base first.

Rosemary essential oil represents a highly concentrated extract of the herb's active ingredients, derived typically through steam distillation, making its potency significantly different from culinary or tea preparations. Because of this high concentration, direct application must be strictly avoided due to the risk of severe irritation or sensitization upon the skin. The text emphasizes that whether creating a facial steam or adding drops to a bath, meticulous dilution in a carrier oil or a substantial water base is mandatory before any topical exposure occurs. A general safety guideline reinforces this, suggesting topical blends should not exceed a 5% concentration, emphasizing caution even when using popular base oils.

What is the critical safety instruction one must follow when preparing to use rosemary essential oil topically, such as in a facial steam?

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